Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fff87d03be3fb07b7417335deb6e4e274ab8e2ec5fd1d966b0d1feb3530cbca7' 
  AND token = 'U+Y4BmuXb0Z84pGXe+bcaDNbtY9kOMw629h4vtBUEn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}